Test your powers of logic with these challenging Su Doku puzzles. The latest title in The Times Fiendish Su Doku series - previously unpublished quality Su Doku puzzles. Includes 180 Fiendish and 20 Super Fiendish puzzles. You don't need to be a mathematical genius to solve the treacherous puzzles in this collection of Fiendishly difficult puzzles - it's simply a question of logic. Perfect for the advanced solver in need of a constant supply of ultra-difficult puzzles, and guaranteed to provide hours of mind-stretching entertainment. Gold title * The more difficult books in the series tend to sell most strongly, as puzzle enthusiasts look for an appropriately tough challenge, and the quality of Times puzzles * From The Times, the No.1 for Su Doku.